Mixed Convection Through Vertical Porous Annuli Locally Heated From the Inner Cylinder

[+] Author and Article Information
C. Y. Choi

Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ 85721

F. A. Kulacki

Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523

J. Heat Transfer 114(1), 143-151 (Feb 01, 1992) (9 pages) doi:10.1115/1.2911239 History: Received February 12, 1991; Revised June 22, 1991; Online May 23, 2008


Mixed convection in a vertical annulus filled with a saturated porous medium is numerically and experimentally investigated. Calculations are carried out under the traditional Darcy assumptions and cover the ranges 10 ≤ Ra ≤ 200 and 0.01 ≤ Pe ≤ 200. Both numerical and experimental results show that the Nusselt number increases with either Ra or Pe when the imposed flow is in the same direction as the buoyancy-induced flow. When the imposed flow opposes buoyancy-induced flow, the Nusselt number first decreases with an increase of the Peclet number and reaches a minimum before increasing again. Under certain circumstances, the Nusselt number for a lower Rayleigh number may exceed that for larger value. Nusselt numbers are correlated by the parameter groups Nu/Pe1/2 and Ra/Pe3/2 . Good agreement exists between measured and predicted Nusselt numbers, and the occurrence of a minimum Nusselt number in mean flow that opposes buoyancy is verified experimentally.

Copyright © 1992 by The American Society of Mechanical Engineers
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